There's also Sybr Green II RNA Gel Stain from Invitrogen; Ex/Em: 254, 497/520 nm, bound to nucleic acid Here's a couple of links: Product note: http://probes.invitrogen.com/media/pis/mp07568.pdf Some tips on using Sybr stains: http://probes.invitrogen.com/media/pis/td004.pdf